Lubricating apparatus



April 9, 1935. J. BYs'rRlcKY r-:rAL 1,996,792

f' V LUBRIGATING APPARAfrUs Filed June 26, 1'933 .Null

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Patented Apr. 9, `1935 I l UNITED s'rli'riss PATENT OFFICE LUBaIcAriNG maands Joseph Bystricky 'and .Walter Schmid, Chicago,

lll., assignors, by mesne assignments, to Stewart-Warner Corporation, chicago, lll., a corporation of Virginia Application June 2s, 1933, serial No. 611,564

s (ci. azi-41.3)

AOur invention relates generally to lubricating which is threaded to receive a coupling member apparatus, and more particularly to an improved 2i. A vlubrlcant'discharge conduit 28 has a iitreservoir construction for portable lubricant comting 3l at its end, which is ladapted to project pressors, usually termed grease guns. into the coupling member 26 and be held in place y In hand operated lubricant compressors in therein by an apertured cap nut 32. 5 which the lubricant is fed to the high pressure A spring pressed cup leather 34 seals the con-` cylinder under the pressure of compressed air, nection between the coupling member 26 andthe difficulty is occasionally experienced due to the fitting ,this cup leatherbeing carried by the leakage of air past the follower or lseparator pisstem of a valve cooperable with a seat 38. 'Ijhe l0 ton conventionally interposed between the lubriconstruction is such that when the iitting 31|4 is 10 cant containing portion of the'barrel and the connected to the coupling member 26 the valve portion which contains the air under' pressure. 36 will be opened. Theother end of the dis.- Provision must also be made in'this type of concharge conduit 2l has a coupler 40 secured therestruction to prevent `canting or tilting of the folto for detachable connection with lubricant relower piston in the barrel. Furthermore, it is ceiving fittings, the couplers shown being particu- 15 usually desirable to provide some means forwithlarly adapted for connection to fittings of the sodrawing the follower piston. lThe partsnecescalled "pin fitting type., vsary to fulll'these requirements are likely to get A barrel 42 is threaded to an annular flange 44 out of order and increase the cost of manufacture formed integrally with! the head lll, a gasket 46 I0 of thecompressor. being lodged in an annular recess formed in the 20 We have therefore devised an improved form head and being adapted to be engaged by the of lubricant compressor in which the necessity foiend of the barrel 42 to forman air-tight Seal.l a follower piston is eliminated, and instead have The barrel 42 is provided with iiangedvrings 48, provided a collapsible flexible sack for containing 50, which denne the handle portion of the barrel the lubricant in the compressor and preventing and prevent the hand from slipping. A 25 admixture of air therewith. The end of the barrel 42 is closed 'by a cap A further object of our invention is to provide 52 which is threaded into the barrel and has a a sack of improved construction to separate the gasket;l 54 for making an air-tight seal therewith. lubricant from the air in a compressed air primed The cap has an air admission. valve 58 secured 80- lubricant compressor. therein, this valve being preferably of the type 30 lA further object is to provide an improved sack used on pneumatic tires. The cap also has a which will collapse to eject substantially all of the relief valve ll8 threaded therein and normally lubricant contained therein. closing a vent opening 88 formed in the cap. The Other objects will appear from the following stem 82 of a handle 64 is secured to the head 52 description, reference being had to the accomby a threaded sleeve 66.' Within the barrel 42 35 panying drawing, in which: adjacent the cap $4 is a cup-shaped stamping Figure l is a central vertical section of our im- 88, the bottom 1l of which is provided with a proved lubricant compressor; x plurality of perforations 12.

Figure 2 is a central longitudinal sectional view Lubricant is supplied to the high pressure cylinof the collapsible lubricant containing sack;

Figure 3 is a fragmentary sectional view therehead Il, the eway 14 terminating in an of, taken on the line33 of Fig.2; and opening 16 into which a bushing 18 is pressed. Figure 4 is an end view of the sack showing it in The bushing may be soldered or welded in place collapsed position. so as to prevent leakage of air from the interior The lubricant compressor of our invention coxnof the barrel 42 to the passageway 14. The bush- 45 prises a head I0 abore I2 forming a high ing 1I has a flange III formed integrally therepressure cylinder for a reciprocable plunger-I4, with, the flange having an annular ridge- 82 v.the escape of lubricant p astthe plunger being preformed thereon. vented by a-packing held in-place by apackins A washer 84 has its surface facing the flange 8|! nut I8. The plunger is reciprocated in the usual formedcomplementally thereto, and is adapted 50 manner by a--le'ver 28 pivotally connected tothe to clamp the end nance 88 of a' rubber sack 88 end of the plunger and to theends of a pair of thereagainst. The washer 84 is clamped against links 22, the other ends of which are pivotally' the flange 88 of the rubber sack by a nut 80 Y connectedtotheheadl. Thebore-l2terminates threaded on the bushing 18. The sack 88 is in an outlet eway 24, the-end, portion of preferably made of a durable, flexible, slightly der l2 through a...passageway 14 formed in the 40 elastic and lubricant-resistant rubber. The sack is generally cylindrical `in shape, except for a longitudinal groove 92 extending along the side wall of the sack substantially the full length thereof. Lubricant is adapted to be supplied to the sack 88 through an extension 94 of the passageway 14, the end of the passageway being normally closed by a plug 96 and sealed by a packing 98.

When it is desired to illl the lubricant compressor, the plug 96 is removed and a suitable nipple carried on the end of aconduit threaded in its place, and lubricant under pressure forced through the conduit and into the passageway extension 94, and the plunger I4 being removed so that the passageway 14 is in communication with its extension 94, lubricant will flow through the bushing y'I8 into the sack, expanding the latter substantially to the shape in which it is shown in Figs. 1 and 2. Previous to this operation the vent valve 58 may be held open so that the sack may expand against atmospheric pressure only. When the sack has been completely filled it will be arrested by the bottom 18 of the cup shaped stamping 68. The lubricant supply conduit may then be disconnected from the end of the passageway extension 94, and the plug 96 replaced.

Thereafter, the vent valve 58 having been closed,

air under pressure may be forced into the handle end of thecompressor barrel 42 through the valve 56. 'I'he compressor is then ready for use and the coupler 40 may be connected to ttings attached to bearings to be lubricated, and the lever 28 and plunger I4 reciprocated to force lubricant under pressure to the bearings.

When the end of the plunger I4 uncovers the passageway 14 the compressed air within the barrel 42 will cause partial collapsing of the sack 88, and consequent discharge of lubricant under pressure into the high pressure cylinder l2. The' collapsing of the sack 88 will take place in a regular manner, due t'o the provision of the groove 92 in the wall thereof.- The air pressure acting upon the surface of the sack around the groove 92 will force that portion of thev sack inwardly until, as the lubricant is forced from the sack,

the latter will assume theshape illustrated in Fig. 4. The outermost end of the sack will collapse iirst and there will be no tendency of the innermost end of the sack to collapse rst and thus form a commotion which might prevent the discharge of all of the lubricant from the sack.

If desired, venting ofthe barrel by opening the valve.. 58 may be omitted prior to the filling operationif the source of lubricant is under sufiicient pressure to feed lubricant against the air pressurewithin the barrel. If the sack 88 should become damaged or wear out, the nut 98 may A substituted therefor, the sack thus fserving as a removable grease cartridge for the grease gun.

While we have shown and described a particular embodiment of our invention it will be readily understood by those skilled in the art that variations may be made in the construction disclosed without departing from the basic features of our invention. We therefore do not wish to be limited to the precise construction disclosed but wish to include within the scope of our nvention all such modifications and variations which will readily suggest themselves.

What we claim as new and desire to secure by United States Letters Patent, is:

1. A lubricant compressor comprising a head having high pressure pumping means associated therewith, an air tight barrel secured to said head, means for supplying air under pressure to said barrel, a collapsible lubricant sack within said barrel for supplying lubricant to said pumping means, and apertured means positioned in said barrel at a point intermediate its ends for preventingexcessive expansion of said sack.

2. A lubricant compressor comprising a head having high pressure pumping means associated therewith, an air tight barrel secured to said head, means for, supplying air under pressure to said barrel, a member for conducting lubricant to said pumping means, and a flexible collapsible lubricant-tight sack removably secured to said member and positioned within said barrel and having its external surface subjected to the air pressure therein and communicating with said high pressure pumping mechanism through said within said barrel, a perforated wall extending across said barrel intermediate the ends of the latter, and check valve means for supplying air under pressure to said barrel.

JOSEPH BYSTRICKY. WALTER SCHMID. 

